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Multiple Choice

$\overset \leftrightarrow{PQ}$ is perpendicular to $\overset \leftrightarrow{RS}$ is symbolically written as

  1. $\overset \leftrightarrow{PQ}\, \perp \, \overset \leftrightarrow{RS}$
  2. $\overset \leftrightarrow{PQ}\, \parallel \, \overset \leftrightarrow{RS}$
  3. $\overset \leftrightarrow{PQ}\, \neq \, \overset \leftrightarrow{RS}$
  4. $\overset \leftrightarrow{PQ}\, = \, \overset \leftrightarrow{RS}$
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